# import matplotlib.pyplot as plt
# score=[107,77,94,87,90,95,92,93,86,101,85,76,96,99,110,89,101,110,97,83,85,83,101,75,80,79,102,91,88,66,76,69,88,60,89,60,70,71,56,83,82,68,76,95,83,65,54,78,687,71,70,63,57,43,71,65,85,40]
# plt.rcParams['font.sans-serif']=['SimHei']
# plt.xlabel('分数')
# plt.ylabel('学生数量')
# plt.title('学生语文成绩分布直方图')
# plt.hist(score,bins=range(0,150,10),facecolor='blue',edgecolor='black')
# plt.show()
# import numpy as np
# arr11=np.array([1.1,2.2,3.3])
# print('一维数组arr：\n',arr11)
# arr111=np.array((-1,-2,-3),dtype='int32')
# print('一维数组arr1：\n',arr111)
# arr1111=np.array([3.,-2.,2.3],dtype='float32')
# print('2*3的二维数组arr2：\n',arr1111)
#2-2
import numpy as np
arr1=np.zeros(2)
print('一维数组arr1:\n',arr1)
arr2=np.zeros((2,3))
print('二维数组arr2:\n',arr2)
arr3=np.ones(3)
print('一维数组arr3:\n',arr3)
arr4=np.ones((3,3))
print('二维数组arr4:\n',arr4)
arr5=np.empty(4)
print('一维数组arr5:\n',arr5)
arr6=np.empty((3,4),dtype='int')
print('二维整型数组arr6:\n',arr6)
arr=np.ones((2,3))*5
print('二维数组arr:\n',arr)